Description: Soak the bird's head in the water and let him "drink". As the water evaporates off of the birds head, it cools. This caused the water to expand into the head of the bird, throwing it off balance and dunking its head in the water again. The process repeats.

Instructions:

Purchased/Built: purchased

Quant. in Demo Room: 2

Demo References

The Video Encyclopedia of Physics Demonstrations

Disc 15-12

Standard drinking bird. Includes animation.

Freier and Anderson

Hj-7

Cooling causes vapor to condense lowering the center of gravity until the bird tips.